TS EN ISO 3098-0

TS EN ISO 3098-0 defines the general rules for lettering used in technical product documentation, especially on technical drawings, and serves as the common basis for the other parts of the series. It is a foundational document for understanding how letters and numerals are presented in a consistent, legible, and standardised way in engineering documentation, with emphasis on the general framework rather than on detailed drawing examples.

Why lettering matters in technical drawings

In technical product documentation, lettering carries dimensions, notes, identifiers, and references that must be communicated without ambiguity. The form, size, and placement of characters affect readability, the consistency of interpretation across teams, and the reduction of documentation errors. In general technical practice, legibility and visual uniformity are essential parts of the drawing language.

What this part contributes to the series

This part sets out the general requirements for lettering and provides the common starting point for applying the other parts of the standard. It helps keep lettering practice aligned across different documents so that the same notation logic is understood in design, drafting, and manufacturing contexts. The standard is focused on lettering within technical product documentation, particularly technical drawings, where clarity, order, and comparability are important.

• Provides the shared lettering framework for the rest of the series.
• Applies to lettering in technical product documentation, especially technical drawings.
• Treats legibility and consistent presentation as core objectives.
• Places lettering rules within the broader ISO 3098 system rather than as a stand-alone drafting convention.